London fog is a well-known term used to describe the thick, grey fog that blankets the city of London. However, there are several other synonyms that can be used to describe this phenomenon. Some popular alternatives include smog, pea soup fog, and thick mist. These terms are often used interchangeably, but each has its own connotations and nuances. Smog, for example, refers to a combination of smoke and fog, while pea soup fog implies a particularly thick and heavy fog. Other synonyms for London fog include haze, murk, and gloom. These terms all evoke a sense of dreariness and obscurity, which are characteristic of the weather in London during the winter months.